Advice on a top end rebuild

Hi, I was thinking of rebuilding the top end on my Seadoo GTX 2001 and I have a question. If you replace the cylinder sleeves with 88mm new ones and buy 88mm pistons do you need to do anything to prior to fitting them? Basically does any work need to be done to either the pistons or cylinders or will they simply fit and work fine? Sorry if this sounds like a stupid question.